669810479 has 4 divisors (see below), whose sum is σ = 721334376. Its totient is φ = 618286584.

The previous prime is 669810473. The next prime is 669810497. The reversal of 669810479 is 974018966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 669810479 - 2¹² = 669806383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669810473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25761929 + ... + 25761954.

It is an arithmetic number, because the mean of its divisors is an integer number (180333594).

Almost surely, 2^669810479 is an apocalyptic number.

669810479 is a deficient number, since it is larger than the sum of its proper divisors (51523897).

669810479 is a wasteful number, since it uses less digits than its factorization.

669810479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51523896.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 669810479 is about 25880.6970346627. The cubic root of 669810479 is about 874.9514983728.

The spelling of 669810479 in words is "six hundred sixty-nine million, eight hundred ten thousand, four hundred seventy-nine".